I've been fearful that Glen Davis will have a hard time dealing with so few minutes after playing big minutes and shining last Spring. The Herald discusses this today in length with some thoughts from Davis:

“It’s real difficult to go back, from playing 30 minutes or even 35 on a good night, to playing 12 or 15 on a good night,” Davis said. “There’s a lot of great players on this team.”
Surely, he’s being hard on himself. Surely, there’s more playing time in store.
“I hope so,” he said.
As a result, Davis now faces a significant mental challenge. He must accept a smaller role.
“I don’t know how to accept that yet,” he said. “I don’t know how to do it yet. It’s not as if we’ve gone over it. Nobody tells me nothing.”